Related Clues:
- Air-freshener target
- Memory trigger, at times
- What methane's missing
- It may be masked
- Characteristic smell
- It's missing from carbon monoxide
- It's around the dumpster
- What wavy lines signify in the comics
- Hardly an enticing aroma
- Sole problem?
- Bad smell
- Dump emanation
- Sensory stimulant
- Musk feature
- Scratch-'n'-sniff sticker feature